US4639608A - Image read-out apparatus with light source driving means - Google Patents

Image read-out apparatus with light source driving means Download PDF

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Publication number
US4639608A
US4639608A US06/609,197 US60919784A US4639608A US 4639608 A US4639608 A US 4639608A US 60919784 A US60919784 A US 60919784A US 4639608 A US4639608 A US 4639608A
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Prior art keywords
light source
image
blocks
image sensor
turned
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Expired - Lifetime
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US06/609,197
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English (en)
Inventor
Yasuo Kuroda
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Canon Inc
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Canon Inc
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Priority claimed from JP58085891A external-priority patent/JPS59212071A/ja
Priority claimed from JP58095680A external-priority patent/JPS59223059A/ja
Application filed by Canon Inc filed Critical Canon Inc
Assigned to CANON KABUSHIKI KAISHA 30-2, 3-CHOME, SHIMOMARUKO, OHTA-KU, TOKYO, JAPAN A CORP. OF JAPAN reassignment CANON KABUSHIKI KAISHA 30-2, 3-CHOME, SHIMOMARUKO, OHTA-KU, TOKYO, JAPAN A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KURODA, YASUO
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
    • H04N1/031—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors

Definitions

  • the present invention relates to an image read-out apparatus for reading out image information by illuminating an original.
  • photo reaction type sensors made of amorphous silicon material have been used.
  • the sensor made of such material exhibits a change in resistance responsive to the intensity of the light emitted onto the sensor. Therefore, by constituting a circuit so that this resistance change is detected using an electrical circuit, the intensity of the light to be emitted onto the sensor can be output as an electrical signal.
  • this type of sensor has the problem that, when the light is emitted thereon, its sensitive characteristic gradually deteriorates in proportion to the time it is subjected to the light emission. Consequently, there is the problem that if the light is continuously emitted onto all sensors while the signals of the sensors are being read out, it will cause deterioration in the sensitivity of the sensors and will result in a loss of their function as sensors for a short time.
  • FIG. 1 is a cross sectional view showing a constitution of a sensor and a light source section of an image read-out apparatus, in which a reference numeral 1 denotes a sensor made of amorphous silicon material.
  • Light condensing material 2 serves to focus the light from a light source, 3 which may as shown comprise light source units on opposite sides of light condensing material 2 reflected from a read-out point P on an original 4 into the sensor 1.
  • FIG. 2 diagrammatically illustrates an arrangement of the sensor and light source in FIG. 1, in which numerals 1 and 3 are common to those in FIG. 1.
  • the sensor 1 is constituted by many blocks (SB1, SB2, . . .) each consisting of four sensor elements (S1-S4, S5-S8 . . .).
  • the light source 3 is also constituted of many blocks represented by D1 through Dn (where n is a natural number). In this light source 3, the size of each block Di (where i is a natural number from 1 to n) is set to be substanitally equal to a size of one block of the sensor.
  • the time when the sensor is irradiated can be set into a factor of total number of blocks. Namely, the quantity of light to be emitted ot the sensor 1 can be minimized, thereby enabling deterioration in sensitivity of the sensor to be retarded by a corresponding amount.
  • an image read-out sensor which is constituted by an array of optical sensors such as CCDs (charge coupled devices) arranged fully in the location corresponding to a whole width of an original in the facsimile apparatus or an apparatus for entering characters, picture, etc.
  • CCDs charge coupled devices
  • Such a read-out sensor together with a light source arranged similarly along the width of original constitutes an image read-out apparatus and serves to read out a picture on the original by means of the light read out a picture on the original by means of the light from the light source to be reflected through the original.
  • a number of LEDs used as the light source are arranged in a line near the read-out sensor for the purpsoes of miniaturization and decrease in weight of the apparatus.
  • the ligth source is arranged so as to exceed the original width to compensate for a decrease in the quantity of light at both end portions of the original.
  • the light source is arranged soa s to extend an additional 10 mm or so, at both ends beyond the arrangement width of the read-out sensor which is equal to the width of the original.
  • the whole length of the light source made up of the LEDs is about 230 mm.
  • the arrangement pitch of the LEDs is set to be so small as about 1.25 mm to prevent deterioration in light quantity distribution characteristic due to variation in the quantity output by light of each LED, a total of 184 LEDs will be needed.
  • electric power consumption per LED is 40 mW, then when all LEDs are lit, heat generation of total 7 W or more would be produced.
  • the luminous intensity at 50° C. is about 20%. Furthermore, a quantity of light to be emitted from the LED also deteriorates even due to the heat generation of the LED itself. Therefore, radiation fins are ordinarily attached to the light source using LEDs of this kind to suppress the influence of the heat. As a result, the size of a light source section inevitably becomes large, causes a problem regarding miniaturization and decrease in the weight of the apparatus.
  • the photo sensor 1 and light source 3 are controlled with timings as shown in FIGS. 4A-4E.
  • the blocks SB1 to SB4 of the photo sensor 1 are sequentially enabled one by one and each light source block D2 to D5 is also sequentially lit and controlled synchronously with this. (However, although each sensor block SB1-SB4 is strobed for every block, each photo sensor element in a block is sequentially enabled.)
  • a second object of the invention is to suppress an amount of heat generation in a light source and thereby to prevent deterioration in characteristic of the light source.
  • a third object of the invention is to miniaturize the light source by making radiation fins and the like unnecessary and further to miniaturize a power source section by making a capacity of the power source small thereby realizing decrease in size and weight of the whole apparatus.
  • FIG. 1 is a diagrammatical view showing a constitution of a sensor and a light source of an image read-out apparatus
  • FIG. 2 is an explanatory view showing diagrammatically an arrangement of the sensor and light source of the image read-out apparatus in FIG. 1;
  • FIG. 3 shows a characteristic diagram of a distribution of a quantity of light which is emitted from the light source into the sensor block according to a conventional read-out method
  • FIGS. 4A to 4E show timing charts to describe the image read-out and light source control operations in a conventional image read-out apparatus
  • FIGS. 5, 6 and 7A-7C are diagrams to explain a first embodiment of the present inention, in which FIG. 5 is a diagram showing a circuit for generating a drive signal to drive the light source;
  • FIG. 6 is a diagram showing a sensor signal fetching circuit
  • FIG. 7A shows a waveform diagram of a light source light-on clock signal which is input ot the drive signal generating circuit for the light source of FIG. 5;
  • FIG. 7B shows a waveform diagram of a read-out clock signal which is input to the sensor signal fetching circuit of FIG. 6;
  • FIG. 7C shows a waveform diagram to explain the operation timings of the drive signal generating circuit for the light source in FIG. 5 based on the light source light-on clock waveforms shown in FIG. 7A;
  • FIG. 8 is a characteristic diagram showing a distribution of a quantity of light which is emitted into the sensor block according to a light source lighting method of the present inventio;
  • FIG. 9 is a block diagram showing a constitution of a light source control unit in an image read-out apparatus of a second embodiment of the inentin.
  • FIG. 10 shows a timing chart to explain the image read-out and light source light-on timings in the image read-out apparatus of the second embodiment of the invention.
  • FIGS. 5 and 6 are diagrams to describe a first embodiment of the present invention, in which FIG. 5 shows a circuit for generating a drive signal for the light source and FIG. 6 shows a circuit for fetching a sensor signal.
  • FIGS. 5 and 6 show a circuit for fetching a sensor signal.
  • the operations of the circuits shown in FIGS. 5 and 6 will be described hereinbelow using timing waveforms shown in FIGS. 7A and 7B.
  • a reference numeral 5 denotes flip flops (F.F), in which S indicates a set terminal, R is a reset terminal, and Q and Q are output terminals, respectively.
  • This drive signal generating circuit for the ligth source is constituted in the manner such that when a clock (CLE) waveform shown in FIG. 7A is input from an input terminal 6, flip flops F.F1 to F.F3 are set in response to the leading edge of 1P-CLK and the output terminal Q becomes "1", and that the light sources D1 to D3 are lit on by a light source element drive circuit 7.
  • CLE clock
  • switches 8 SW513-SW5166 of the sensor signal fetching circuit shown in FIG. 6 are made opeative at timings of read-out clocks shown in FIG. 7B, thereby fetching the signals.
  • This read-out operation is performed when the clock waveform is "1".
  • the signals are read out from the matrix constitution.
  • the F.F1 of the flip flop 5 shwon in FIG. 5 is reset in response to the trailing edge of 1P-CLK.
  • the output Q of the F.F4 is set to "1" in response to the leading edge of 2P-CK provided that (1) the output Q of the F.F1 is "0" and (2) the output Q of the F.F2 is “1” and (3) the output Q of the F.F3 is “1", so that the light sources of D2, D3 and D4 are turned on.
  • the drive signal generating circuit for the light source shown in FIG. 6 reads out the sensor outputs of S5 to S8 at the timings of the read-out clock shown in FIG. 7B similarly to the manner mentioned before.
  • the present embodiment is constituted as described above, and by lighting one sensor block and the light source block which faces this sensor block and the light source blocks at both ends thereof as shown by a curve B in FIG. 8, it is possible to obtain a uniform light quantity distribution over the whole surface of the sensor block. Therefore, an effect such that the correction circuit which has been conventionally used can be removed is obtained.
  • a light emitting element such as an LED may be used as the light source.
  • the sensor block to be read out can be substantially uniformly illuminated, so that it is possible to remove the circuit for correcting for the lack of light at both ends of the sensor that has been conventionally used. Therefore, this allows the sensor signal fetching circuit to be remarkably simplified and a remarkable decrease in cost is realized.
  • FIG. 9 shows a constitution of a second embodiment of the light source control unit which is used in the present invention.
  • the image read-out apparatus for use ina facsimile apparatus and the like will be described hereinbelow as the embodiment.
  • reference numerals 9, 10, and 15 to 18 indicate RS flip flops each of which is constituted by a flip flop element or a combination of gate elements. As shown in the diagram, flip flops 15-18 each having a plurality of set or reset input terminals are used.
  • This circuit has three input terminals indicated by reference characters CLOCK, START and RESET and a clock pulse is input to a counter 12 and an AND gate 19 from the input terminal CLOCK.
  • a reset pulse for allowing the new light source control to be started from the beginning is inut from the input terminal RESET.
  • Counters 12 and 13 and flip flops 15-18 are reset in response to this reset pulse, so that the respective light source blocks D2-D5 are reset into the light-off state.
  • a set pulse for allowing the light source control to be started is input from the input terminal START to set terminals of the flip flops 9 and 15.
  • An output of the flip flop 9 is input to the counter 12, thereby setting the counter 12 into the count enable state.
  • the flip flop 9 is reset and the flip flop 10 is set through a decoder 11 in response to an output of the counter 12.
  • the AND gate 19 opens, thereby allowing the counter 13 to start the counting of the clock pulse.
  • the decoder 14 is controlled based on the counting of a predetermined value by this counter 12, and the flip flops 15 to 18 are set and reset in response to five outputs of a decoder 14 in accordance with the count number of the counter 13.
  • the flip flop 16 is set in response to an output .0.1 of the decoder 14 and the flip flop 15 is reset and the flip flop 17 is set in response to an output .0.2.
  • the flip flop 16 is reset and the flip flop 18 is set responsive to an output .0.3.
  • the flip flop 15 is set and the flip flop 17 is reset in response to an output .0.4.
  • the flip flop 18 is reset responsive to an output .0.5.
  • each light source block D2-D5 using LEDs is arranged for the photo sensor 1 in the similar manner as the conventional example as shown in FIG. 2 as mentioned before.
  • FIG. 10 shows a timing chart for the light-on control which is similar to FIG. 4.
  • a reset pulse is inut from the input terminal RESET to reset each flip flop and counters 12 and 13.
  • a start pulse is input from the input terminal START to set the flip flops 9 and 15.
  • the counter 12 is set into the count enable state, allowing the light source block D2 to be turned on.
  • the counter 12 When the counter 12 counts the clock pulse equal to a time T1 shown in a timing chart of FIG. 10, i.e., to the time until the sense timing of the sensor block 1, it resets the flip flop 9 and set the flip flop 10 through the decoder 11, respectively.
  • the AND gate 19 opens in association with the setting of this flip flop 10, thereby allowing the counter 13 to start the counting of the clock pulse.
  • the decoder 14 sets the flip flop 16 by the output .0.1, thereby causing the light source block D3 to be turned on. It is preferable to set the light-on timing of this light source block D3 into the time point when the original scanning location reaches the intermediate point of the sensor block SB1 as shown in FIG. 10. Due to this, it is possible to individually control the left half region and right half region based on the intermediate point as a center.
  • the decoder 14 resets the flip flop 15 and sets the flip flop 17 by the output .0.2. Due to this, the light source block D2 is turned off and the light source block D4 is turned on. At this time, the light source block D3 is continuously lit since the flip flop 16 is held set.
  • the decoder 14 resets the flip flop 16 and sets the flip flop 18 by the output .0.3. Due to this, the light source block D3 is turned off and the light source block D5 is turned on while the light source block D4 remains lit.
  • the flip flop 17 is now reset and the flip flop 15 is set in response to the output .0.4 of the decoder 14.
  • the light source block D4 is turned off and the light source block D2 is turned on while the light source block D5 is lit.
  • the flip flop 18 is reset in response to the output .0.5 of the decoder 14, thereby cuasing the light source block D5 to be turned off. Subsequently, when the counting of the time T3 is performed, the decoder 14 sequentially outputs from the output .0.1, so that the light source blocks are controlled for every block in the manner as described above.
  • the adjacent light source blocks ont he side near the scanning location are controlled so that they are reliably lit when scanning. Therefore, a lack of light at the end portions of the light source block as in the conventioal arrangement does not occur.
  • the light source and photo sensor are divided into four blocks, respectively, for the purposes of convenience and simplicity, and the half blocks thereof are reliably lit. Therefore, the electric power consumption and the amount of heat generation are merely one half of those of the all light source light-on method.
  • the heat generation and electric power consumption can be further reduced, so that this prevents deterioration of the elements such as LEDs which are used as the light source, and a decrease in light emission.
  • it is possibel to omit the heat radiating means which has been conventionally provided, thereby enabling the light source section and power source section to be decreased in size. Consequently, the invention is useful for miniaturizing the entire apparatus in which the light source and power source sections are adopted.
  • animage readout apparatus having means for illuminating a picture image by sequentially lighting a plurality of light sources arranged adjacently to read out the image, there is provided control means for holding the light-on of one light source adjacent to the light source when each light source is lit on. Therefore, it is possible to provide an excellent image read-out apparatus which can reduce the amount of heat generation of the light source and prevent deterioration in characteristics of the light emitting elements, and can realize the reduction in size and weight of the whole apparatus in which the light source section, power source section and the like are used.

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
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US06/609,197 1983-05-18 1984-05-11 Image read-out apparatus with light source driving means Expired - Lifetime US4639608A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP58085891A JPS59212071A (ja) 1983-05-18 1983-05-18 光源の点灯装置
JP58-85891 1983-05-18
JP58-95680 1983-06-01
JP58095680A JPS59223059A (ja) 1983-06-01 1983-06-01 画像読み取り装置

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Cited By (22)

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US4730220A (en) * 1985-06-13 1988-03-08 Telefunken Electronic Gmbh Device for electronic recording of images with an optical radiation-emitting system and a detector system for detecting the received image information
US4737857A (en) * 1987-06-01 1988-04-12 American Telephone And Telegraph Company Overhead document scanner lighting and scanning apparatus
US4754338A (en) * 1985-11-22 1988-06-28 Fuji Photo Film Co., Ltd. Signal reading circuit for masked and overlapping linear image sensors
US4831460A (en) * 1987-04-21 1989-05-16 Sharp Kabushiki Kaisha Image reading apparatus
US4916552A (en) * 1987-12-24 1990-04-10 Ncr Corporation Optical reader head with video compensation method and circuit which integrates four adjacent pixels into a composite pixel
US4926058A (en) * 1986-01-27 1990-05-15 Canon Kabushiki Kaisha Image reading apparatus with block lighting and pulsing
US5028802A (en) * 1990-01-11 1991-07-02 Eye Research Institute Of Retina Foundation Imaging apparatus and methods utilizing scannable microlaser source
US5063462A (en) * 1984-03-21 1991-11-05 Canon Kabushiki Kaisha LED array and partitive driving method therefor using overlapping activation periods
US5162919A (en) * 1990-01-12 1992-11-10 Fuji Photo Film Co., Ltd. Light beam scanning apparatus using sequentially activated shutters and light sources
US5164603A (en) * 1991-07-16 1992-11-17 Reynolds Metals Company Modular surface inspection method and apparatus using optical fibers
US5300768A (en) * 1992-01-17 1994-04-05 Mita Industrial Co., Ltd. Including a processing means for driving designated photoelectric detectors for the checking thereof
US5311017A (en) * 1990-10-16 1994-05-10 Simon Marketing, Inc. Imaging device and method for developing, duplicating and printing graphic media
US5406070A (en) * 1993-12-16 1995-04-11 International Business Machines Corporation Method and apparatus for scanning an object and correcting image data using concurrently generated illumination data
US5517328A (en) * 1993-10-01 1996-05-14 Xerox Corporation Wobble and bow correction by dual spot pixel intensity proportioning
US5548120A (en) * 1994-11-14 1996-08-20 Eastman Kodak Company Linear integrating cavity light source for infra-red illumination of sensitized media
US5608547A (en) * 1993-04-22 1997-03-04 Minolta Camera Kabushiki Kaisha Image forming apparatus having illumination direction altered for every plurality of readout operations with respect to one original
US6320681B1 (en) * 1996-01-19 2001-11-20 Canon Kabushiki Kaisha Image reading apparatus
US6665099B1 (en) * 1998-03-05 2003-12-16 Primax Electronics Ltd. Device and method for controlling light exposure
US20060033938A1 (en) * 2004-08-12 2006-02-16 Kopf Dale R Image-forming apparatus
US20160241733A1 (en) * 2015-02-18 2016-08-18 Xerox Corporation Led illumination uniformity
EP3078359A1 (en) 2015-04-06 2016-10-12 Covidien LP Mat based antenna and heater system, for use during medical procedures
US20230018657A1 (en) * 2019-12-26 2023-01-19 Nec Platforms, Ltd. Image reading device, image reading control method, and recording medium storing image reading control program

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5063462A (en) * 1984-03-21 1991-11-05 Canon Kabushiki Kaisha LED array and partitive driving method therefor using overlapping activation periods
US4730220A (en) * 1985-06-13 1988-03-08 Telefunken Electronic Gmbh Device for electronic recording of images with an optical radiation-emitting system and a detector system for detecting the received image information
US4754338A (en) * 1985-11-22 1988-06-28 Fuji Photo Film Co., Ltd. Signal reading circuit for masked and overlapping linear image sensors
US4926058A (en) * 1986-01-27 1990-05-15 Canon Kabushiki Kaisha Image reading apparatus with block lighting and pulsing
US4831460A (en) * 1987-04-21 1989-05-16 Sharp Kabushiki Kaisha Image reading apparatus
US4737857A (en) * 1987-06-01 1988-04-12 American Telephone And Telegraph Company Overhead document scanner lighting and scanning apparatus
US4916552A (en) * 1987-12-24 1990-04-10 Ncr Corporation Optical reader head with video compensation method and circuit which integrates four adjacent pixels into a composite pixel
US5028802A (en) * 1990-01-11 1991-07-02 Eye Research Institute Of Retina Foundation Imaging apparatus and methods utilizing scannable microlaser source
US5162919A (en) * 1990-01-12 1992-11-10 Fuji Photo Film Co., Ltd. Light beam scanning apparatus using sequentially activated shutters and light sources
US5321263A (en) * 1990-10-16 1994-06-14 Simon Marketing, Inc. Recording target
US5311017A (en) * 1990-10-16 1994-05-10 Simon Marketing, Inc. Imaging device and method for developing, duplicating and printing graphic media
US5334836A (en) * 1990-10-16 1994-08-02 Simon Marketing, Inc. Imaging device having a passive compliant card scanner and a validation sensor
US5164603A (en) * 1991-07-16 1992-11-17 Reynolds Metals Company Modular surface inspection method and apparatus using optical fibers
US5300768A (en) * 1992-01-17 1994-04-05 Mita Industrial Co., Ltd. Including a processing means for driving designated photoelectric detectors for the checking thereof
US5608547A (en) * 1993-04-22 1997-03-04 Minolta Camera Kabushiki Kaisha Image forming apparatus having illumination direction altered for every plurality of readout operations with respect to one original
US5517328A (en) * 1993-10-01 1996-05-14 Xerox Corporation Wobble and bow correction by dual spot pixel intensity proportioning
US5406070A (en) * 1993-12-16 1995-04-11 International Business Machines Corporation Method and apparatus for scanning an object and correcting image data using concurrently generated illumination data
US5548120A (en) * 1994-11-14 1996-08-20 Eastman Kodak Company Linear integrating cavity light source for infra-red illumination of sensitized media
US6320681B1 (en) * 1996-01-19 2001-11-20 Canon Kabushiki Kaisha Image reading apparatus
US6665099B1 (en) * 1998-03-05 2003-12-16 Primax Electronics Ltd. Device and method for controlling light exposure
US20060033938A1 (en) * 2004-08-12 2006-02-16 Kopf Dale R Image-forming apparatus
US7277107B2 (en) 2004-08-12 2007-10-02 Hewlett-Packard Development Company, L.P. Image-forming apparatus
US20160241733A1 (en) * 2015-02-18 2016-08-18 Xerox Corporation Led illumination uniformity
EP3078359A1 (en) 2015-04-06 2016-10-12 Covidien LP Mat based antenna and heater system, for use during medical procedures
US20230018657A1 (en) * 2019-12-26 2023-01-19 Nec Platforms, Ltd. Image reading device, image reading control method, and recording medium storing image reading control program
US11863725B2 (en) * 2019-12-26 2024-01-02 Nec Platforms, Ltd. Image reading device, image reading control method, and recording medium storing image reading control program

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DE3418366C2 (enrdf_load_stackoverflow) 1992-01-09

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